It’s close to that, actually. This website tracks Biden’s budget to 65% for entitlements.
https://www.thebalancemoney.com/u-s-federal-budget-breakdown-3305789
SS and Medicare are NOT entitlement programs. I paid into it for 50 years. And they STILL take the Part B Premium right out of your SS paycheck...every month...and it’s about $175/mo now. So I’m still paying over $2000 a year for this “entitlement”. Ten years in...that’s $20,000.